Malicious PDF — malware analysis report

Static analysis result for SHA-256 55a7cbc4c39c77bf…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 16:11:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 31b6c66f3468461efc4064ad5cd53c93 SHA-1: 5403eff3bb73429e1a46b43ec99df7f1dfa3f7f2 SHA-256: 55a7cbc4c39c77bf3fd4f44c4a73220190683c9e69fb4ce73709c3b50656341e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://philabc.ru/uplcv?utm_term=how+does+a+compression+tester+work PDF link annotation
    • https://webtechnocrats.com/upload/file/85962281483.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/j94bvrsrrp89a7779anqijec24/20990285755.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/lupitagokusamofej.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/juzonifulederewa.pdfIn PDF document text
    • http://wang023spa.com/userfiles/202107file/2021072314315070554.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/41457643453.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4fd9d49b---kakovozobikizuwusajup.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/wibamaza.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/meluwasupet.pdfIn PDF document text
    • https://securitydm.com/slicice/file/50228530837.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/33604733154.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/84ca1b6e40d6d1467fb19d99bcba2386/77133303326.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b0102268de0---80697531748.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/77165487354.pdfIn PDF document text
    • http://tremonttemplemacon.com/clients/862779/File/48756222309.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rifat.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/6e32ab9244844de6ab7542afe4bf4e3a/pemafunolixige.pdfIn PDF document text
    • http://wohntraumgmbh.at/wozumajagog.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/b5b8b2f50215318e8c1edc0c350b5f12/gaposulijofobanalag.pdfIn PDF document text
    • https://isleo.com/i_photos/file/56726739947.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/7514858d71986e24d439a61ee35d2301/jomixewekezenunej.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/73516194674.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/48396439473.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 10796 bytes
SHA-256: 5836f57491dee169df467aee8075edeaa84e5e1b045a9ac011d0325f88f6c19e
font_02_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 16692 bytes
SHA-256: 4f8dd905e100070f8b0a52d878b478b8d462bac0ffb78cae8b5dfd9e7be98e0b

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